Hamme



(No Model.)

A. C. BECKWITH.

HAMMER. Nov 559,660. Patented May 5, 1896.

WITNESSES: l/VVE/VTOI? ATTORNEYS.

UNrrno STATES ATEN'r FHQE;

ARTHUR O. BECKlVITH, OF CHICAGO, ILLINOIS.

HAMME SPECIFICATION forming part of Letters Patent No. 559,660, dated May 5, 1896.

Application filed October 2 6 18 9 5.

To all 2071,0770 it may concern:

lie it known that I, ARTHUR CLINTON BECK- WITH, of Chicago, in the county of Cook and State of lllinois, have invented a new and Improved Hammer, of which the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved hammer which is simple and durable in construction and arranged to actuate a chisel or other tool by means of a motive agent in a simple and effective manner.

The invention consists principally of a cylinder provided with a bearing for a chisel or other tool, the cylinder having a motive-agent inlet-port and exhaust-ports, and a piston fitted to slide and to turn in the said cylinder and adapted to strike the said tool, the piston being provided with channels and ports adapted to register alternately with the inletport and one of the said exhaust-ports.

The invention also consists of certain parts and details and combinations of the same, as will be fully described hereinafter, and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference in dicate corresponding parts in all the views.

Figure 1 is a sectional side elevation of the improvement. Fig. 2 is a transverse section of the same on the line 2 2 of Fig. 1. Fig. 3 is a plan view of the piston, and Fig. i is an inverted plan view of the same.

The improved. hammer is provided with a cylinder A, formed at one end with a handle A and carrying at its other end a bearing B, in which is fitted to slide the shank C of a chisel C or other tool adapted to be actuated by the hammer. In the cylinder A is fitted to slide and to turn a piston D, formed on its top with the longitudin ally-extendin g grooves a and h, terniinatingin the ports 0 and (Z, respectively. The groove a extends from the outer end of the piston to within a short distance of the inner end, and the other groove l2 extends from the inner end of the piston to within a short distance of the outer end, as will be readily understood by reference to Fig.

The ports 0 and d are adapted to alternately register with a port a, formed in the wall of the cylinder A and lcadin g to alongitudinallp Serial No. 566,989. (No model.)

extending channel f, connected at its outer end with an apertnred boss E, connected by a pipe, hose, or the like with the suitable source of motive-agent supply. The ports 0 and (Z are also adapted to register alternately with exhaust-ports g and h, formed in the wall of the cylinder A on opposite sides of the port 8.

In the under side of the piston D is formed a spiral groove 2, terminating in the straight ends 6' '5 as is plainly shown in Fig. i, and into this groove extends a friction-roller F,

held on the inner end of a bolt G, screwing in the cylinder A.

The operation is as follows: When the several parts are in the position illustrated in Fig. 1, the port 0 registers with thei11letport e and the inner end of the groove 7) registers with the exhaust-port h. The motive agent passing into the channel f passes through the registering ports 8 and 0 into the groove a to exert a pressure on the piston D and cause the latter to slide forward in the direction of the arrow 0., the piston finally striking with its inner end the projecting shank G of the tool 0, so as to drive the latter outward and firmly in engagement with the material under treatment. The piston D in its forward travel in the cylinder is caused to turn by the action of the friction-roller F on the spiral groove i, so that finally the groove a is disconnected from the port 6, and when the piston D arrives at the end of its outward stroke the port cl is in register with the port e, and the motive agent new passes through the said port in to the groove 1) and to the inner end of the cylinder A, to act on the inner end of the piston D and force the latter in the inverse direction of the arrow c/.that is, on the back stroke. By the piston D being turned upon arriving at the end of its stroke the channel a is forced to register with the c.\'- haust-port 9', so that the steam previously passed into the cylinder by the registering ports (2 a and groove (t is now exhausted to the outside. hen the piston D is on the return stroke, it is again turned by the action of the friction-roller F in the groove i, so that the groove 1) is disconnected from the port 6 and the port 0 is again moved in register with the port 6, as shown in Fig. 1, and at the same time the turning of the piston D brings the groove 7) into register with the exhaust-port h and permits the motive agent to escape to the outside on the next forward stroke of the piston.

It will be seen that the device is very simple in construction, being composed of but two principal parts, the cylinder A and the piston D, the latter forming its own valve for controlling the admission and exhaust of the motive agent.

It is understood that in using the hammer the operator by having hold of the handle A can conveniently guide the tool 0 on the article or material to be treated.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. Ahammer, comprising a cylinder having a bearing for a tool at one end and provided with a longitudinal channel having its outer end connected with a motive-agent supply, an inlet-port leading from the inner end of the channel into the cylinder and exhaustports on opposite sides of the inlet-port, and a piston fitted to slide and turn in the cylinder, the piston being provided with two grooves, one extending from the outer end of the piston to Within a short distance of the inner end and the other extending from the inner end to Within a short distance of the outer end, each of said grooves terminating in a port, substantially as described.

2. A hammer, comprisinga cylinder havlnL a bearing for a tool at one end and provided with a longitudinal channel, an apertured boss With which the outer end of the channel communicates, a port leading from the inner end of the channel into the cylinder, and exhaust-ports on opposite sides of the inlet-port. apiston in the cylinder and provided on one side with two grooves, one extending from the outer end of the piston to within a short distance of the inner end and the other from the inner end to Within a short distance or the outer end, each groove being provided with a port, the piston also being provided with a spiral groove, and a roller carried by the cylinder and Working in the said spiral groove, substantially as herein shown and described.

ARTI'IUR C. BECKXVITH. 'Witn esses GEORGIETTIE A. HOGUE, hlARIA, D. NEIsWoNGER. 

